/*
* JBoss, Home of Professional Open Source.
* Copyright 2011, Red Hat, Inc., and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.as.controller.operations.common;
import java.util.Locale;
import org.jboss.as.controller.ControllerMessages;
import org.jboss.as.controller.OperationContext;
import org.jboss.as.controller.OperationFailedException;
import org.jboss.as.controller.OperationStepHandler;
import org.jboss.as.controller.SimpleAttributeDefinition;
import org.jboss.as.controller.SimpleAttributeDefinitionBuilder;
import org.jboss.as.controller.descriptions.DefaultOperationDescriptionProvider;
import org.jboss.as.controller.descriptions.DescriptionProvider;
import org.jboss.as.controller.descriptions.ModelDescriptionConstants;
import org.jboss.as.controller.descriptions.common.CommonDescriptions;
import org.jboss.as.controller.parsing.ParseUtils;
import org.jboss.dmr.ModelNode;
import org.jboss.dmr.ModelType;
/**
* Operation that resolves an expression (but not against the vault) and returns the resolved value.
*
* @author Brian Stansberry (c) 2011 Red Hat Inc.
*/
public class ResolveExpressionHandler implements OperationStepHandler, DescriptionProvider {
public static final String OPERATION_NAME = "resolve-expression";
public static final ResolveExpressionHandler INSTANCE = new ResolveExpressionHandler();
public static final SimpleAttributeDefinition EXPRESSION = new SimpleAttributeDefinitionBuilder("expression", ModelType.STRING, true)
.setAllowExpression(true).build();
private ResolveExpressionHandler() {
}
@Override
public void execute(OperationContext context, ModelNode operation) throws OperationFailedException {
// Run at Stage.RUNTIME so we get the current values of system properties set by earlier steps in a composite
context.addStep(new OperationStepHandler() {
@Override
public void execute(OperationContext context, ModelNode operation) throws OperationFailedException {
ModelNode toResolve = EXPRESSION.validateOperation(operation);
if (toResolve.getType() == ModelType.STRING) {
toResolve = ParseUtils.parsePossibleExpression(toResolve.asString());
}
try {
ModelNode resolved = toResolve.resolve();
ModelNode result = context.getResult();
if (resolved.isDefined()) {
result.set(resolved.asString());
}
context.completeStep(OperationContext.RollbackHandler.NOOP_ROLLBACK_HANDLER);
} catch (SecurityException e) {
throw new OperationFailedException(new ModelNode().set(ControllerMessages.MESSAGES.noPermissionToResolveExpression(toResolve, e)));
} catch (IllegalStateException e) {
throw new OperationFailedException(new ModelNode().set(ControllerMessages.MESSAGES.cannotResolveExpression(toResolve, e)));
}
}
}, OperationContext.Stage.RUNTIME);
context.completeStep(OperationContext.RollbackHandler.NOOP_ROLLBACK_HANDLER);
}
@Override
public ModelNode getModelDescription(Locale locale) {
ModelType valueType = null;
DescriptionProvider delegate = new DefaultOperationDescriptionProvider(OPERATION_NAME,
CommonDescriptions.getResourceDescriptionResolver("core"), ModelType.STRING, valueType, EXPRESSION);
ModelNode result = delegate.getModelDescription(locale);
result.get(ModelDescriptionConstants.REPLY_PROPERTIES, ModelDescriptionConstants.NILLABLE).set(true);
return result;
}
}